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Table 1 Phoneme-viseme mapping of SAPI American English Phoneme Representation. There are 43 phonemes and 22 visemes.

From: Optimization of an Image-Based Talking Head System

Viseme type no. Phoneme Viseme type no. Phoneme
0 Silence 11 ay
1 ae, ax, ah 12 h, hh
2 aa 13 r
3 ao 14 l
4 ey, eh, uh 15 s, z
5 er 16 sh, ch, jh, zh
6 iy, y, ih, ix 17 th, dh
7 w, uw 18 f, v
8 ow 19 d, t, n
9 aw 20 k, g, ng
10 oy 21 p, b, m